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San Tan Valley, AZ Weather. The average temperature of San Tan Valley is 71.43Â°F, which is much higher than the Arizona average temperature of 65.97Â°F and is much higher than the national average temperature of 54.45Â°F. Historical Weather. Heating Cost Index, #76.
Driving Directions to San Tan Valley, AZ including road conditions, live traffic updates, and reviews of local businesses along the way. MapQuest Driving Directions to San Tan Valley, AZ Legal